This rainbow cloud over Mount Everest took Oleg Bartunov, 51, by surprise. He caught the spectacle on camera during a Himalayas expedition in Nepal. His two images show almost the whole spectrum of the rainbow in a natural event rarely recorded at Mount Everest.
Lenticular cloud, Russia. Captured just at the right moment, when the sun is directly striking the bottom of the cloud and light is refracted through the top of the cloud. It gives an amazing two-tone effect. 'I just learned that this is a hydrogen bomb building a mushroom cloud. Destruction has its short moments of beauty too..'